Bouncy objects bounce higher and higher

[quozl]

• right-click on the circle or triangle tool button,
• select all three characteristics to the left (feather, basketball, skates),
• click and drag half way up the canvas to create the object. and for a triangle make the base horizontal,
• try different sizes.

The object will fall and bounce, and will not gain any rotational momentum.

Some objects eventually stop moving.

Large objects bounce higher and higher each time.

[sparshg]

With the basketball setting, we set restitution=1, a circle bouncing should not gain any rotational momentum since there isn't any force acting in the horizontal direction. (Centre of mass is aligned with the point of contact). But it should bounce to the same height.

I think this is more of a Box2D limitation since there are many numerical approximations while Box2D solves for constraints and differential equations. What we can do is set the restitution=0.95 or something so that the system doesn't gain energy and become unstable. What do you think? @chimosky

[chimosky]

I think this is more of a Box2D limitation since there are many numerical approximations while Box2D solves for constraints and differential equations. What we can do is set the restitution=0.95 or something so that the system doesn't gain energy and become unstable. What do you think? @chimosky

A PR showing your hypothesis would be a good idea.